Best MC Load Resistor Type, current gain stage... - diyAudio
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Old 18th August 2006, 10:13 PM   #1
tubenut is offline tubenut  South Africa
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Default Best MC Load Resistor Type, current gain stage...

Hi all

I am inviting opinions.

My phono pre (Electrocompaniet) uses current amplification.
I messed a little with the input load resistor value (10R) onlly to go back to the original value of 10R. I used a fresh commercial grade metal film resistor. The sound just seemed wrong.
Replaced with the original "used" resistors and a all was well.


So what is your favourite load resistor type:
Vishay Bulk MF?
Tantalum?
Precision Carbon?
Any number of Metal Films from Holco, PRP etc?

I guess experience with passive I/V CD stage resistor types would count here as well.

Ta
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Old 18th August 2006, 11:42 PM   #2
SY is offline SY  United States
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Bulk metal foil in that position.
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Old 19th August 2006, 02:06 AM   #3
anatech is offline anatech  Canada
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Hi SY,
Is there that much of a difference? Naked foil or bare (I'm guessing sealed / coated)?

There can be differences in metal film types that are measurable.

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Old 19th August 2006, 02:40 AM   #4
SY is offline SY  United States
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The ones I have are sealed in little square epoxy packages. I'm not sure of the brand- got 'em as a gift.
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Old 19th August 2006, 02:43 AM   #5
anatech is offline anatech  Canada
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Sy,
You're one lucky fella. Good going!

One fella was recommending the naked bulk metal foil over the encapsulated ones because "he could hear a difference". Physiology is a wonderful thing. They cost more he says, that must be it!

That's like having a naked capacitor! Okay, low voltage.

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Old 19th August 2006, 09:20 AM   #6
AndrewT is offline AndrewT  Scotland
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Hi,
if a wire (non inductive wound) resistor were made, what material should sound best?

Copper, constantan, nichrome? Others?
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Old 19th August 2006, 10:57 AM   #7
sreten is offline sreten  United Kingdom
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Hi,

For a virtual earth current amplifier the best load resistor is none at all !

/sreten.
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Old 19th August 2006, 01:57 PM   #8
anatech is offline anatech  Canada
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Hi sreten,
Can't argue that, except you still need a sensing element. That would be doped silicon in most cases (ultimately).

-Chris
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Old 19th August 2006, 02:31 PM   #9
sreten is offline sreten  United Kingdom
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Hi,

To be accurate the cartridge internal resistance becomes the "load"
resistor and the virtual earth current stages voltage gain becomes
directly dependant on the cartridges impedance, self adjusting.

Adding a 10R series "load" resitor simply makes the gain changes
less severe as the cartridge source resistance changes, whether
this is a good idea or not depends on the internal gain setting.

/sreten.
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Old 19th August 2006, 03:24 PM   #10
tubenut is offline tubenut  South Africa
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I think the 10R sit from signal in to ground, that is parallel not series?
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